:root {
  --ink: #11211f;
  --muted: #5b6c68;
  --paper: #f4f5ef;
  --card: #ffffff;
  --line: #dce2dc;
  --teal: #0c7168;
  --teal-dark: #084f49;
  --mint: #dff1e7;
  --lime: #c9e45a;
  --amber: #f5b84b;
  --red: #b8443d;
  --shadow: 0 18px 55px rgba(17, 33, 31, .09);
}
[hidden] { display: none !important; }

* { box-sizing: border-box; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: Inter, Aptos, "Segoe UI", sans-serif; line-height: 1.55; }
a { color: inherit; }
button, select, input { font: inherit; }
.site-header { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 24px; padding: 0 5vw; background: #102c29; color: white; }
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; font-weight: 750; letter-spacing: -.02em; }
.brand-mark { width: 36px; height: 36px; display: grid; place-items: center; border-radius: 10px; background: var(--lime); color: #102c29; font-size: 13px; }
.header-note { color: #c8d8d4; font-size: 13px; }
.app-shell { min-height: calc(100vh - 150px); }
footer { padding: 32px 5vw; color: var(--muted); font-size: 13px; }
.catalog-hero { padding: 80px 5vw 55px; color: white; background: linear-gradient(120deg, #0b201e, #13433e 70%, #176d62); }
.catalog-hero h1 { margin-bottom: 16px; }
.catalog-hero > p:last-child { max-width: 680px; color: #dbe8e5; font-size: 19px; }
.catalog-intro { max-width: 760px; padding: 54px 5vw 0; }
.catalog-intro h2 { margin-bottom: 12px; }
.catalog-intro > p:last-child { color: var(--muted); }
.catalog-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 24px; padding: 36px 5vw 80px; }
.catalog-card, .empty-card { min-height: 240px; padding: 30px; border: 1px solid var(--line); border-radius: 22px; background: var(--card); box-shadow: var(--shadow); text-decoration: none; }
.catalog-card { transition: transform .18s, border-color .18s; }
.catalog-card-live:hover { transform: translateY(-3px); border-color: #89b9ae; }
.catalog-card-coming { color: #42514e; background: linear-gradient(145deg, #fbfcf8, #edf1ea); box-shadow: none; }
.catalog-card-heading { display: flex; align-items: flex-start; justify-content: space-between; gap: 16px; }
.catalog-card-heading .eyebrow { margin-bottom: 18px; }
.catalog-badge { flex: 0 0 auto; padding: 5px 9px; border-radius: 99px; font-size: 10px; font-weight: 850; letter-spacing: .04em; text-transform: uppercase; }
.catalog-badge-available { color: #08534b; background: var(--mint); }
.catalog-badge-comingSoon { color: #6a4b0b; background: #fff0c8; }
.catalog-card h2, .empty-card h2 { font-size: 30px; }
.catalog-card > p { color: var(--muted); }
.catalog-stats { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 24px; }
.catalog-stats span { padding: 6px 10px; border-radius: 99px; color: var(--teal-dark); background: var(--mint); font-size: 12px; font-weight: 750; }
.catalog-preview-note { margin-top: 26px; padding-top: 18px; border-top: 1px solid var(--line); font-size: 12px; font-weight: 700; }
.loading-card, .error-card { max-width: 720px; margin: 10vh auto; padding: 48px; background: var(--card); border: 1px solid var(--line); border-radius: 24px; box-shadow: var(--shadow); }
.loader { width: 24px; height: 24px; display: block; border: 3px solid var(--line); border-top-color: var(--teal); border-radius: 50%; animation: spin .8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.eyebrow { margin: 0 0 10px; color: var(--teal); font-size: 12px; font-weight: 800; letter-spacing: .13em; text-transform: uppercase; }
h1, h2, h3, h4, p { margin-top: 0; }
h1 { max-width: 860px; margin-bottom: 20px; font-family: Georgia, "Times New Roman", serif; font-size: clamp(44px, 6vw, 78px); line-height: .98; letter-spacing: -.045em; }
h2 { font-size: clamp(28px, 4vw, 44px); line-height: 1.08; letter-spacing: -.035em; }
h3 { line-height: 1.2; letter-spacing: -.02em; }
.section-title { display: block; font-size: clamp(28px, 4vw, 44px); font-weight: 750; line-height: 1.08; letter-spacing: -.035em; }
.hero-dek { max-width: 730px; color: #dbe8e5; font-size: clamp(18px, 2vw, 23px); }
.course-hero { display: grid; grid-template-columns: minmax(0, 1.6fr) minmax(280px, .7fr); gap: 5vw; padding: 90px 5vw; color: white; background: radial-gradient(circle at 75% 20%, #1a5f57 0, #102c29 42%, #0b201e 100%); }
.hero-copy { align-self: center; }
.hero-stats { display: flex; gap: 36px; margin-top: 42px; }
.hero-stats div { display: grid; }
.hero-stats strong { color: var(--lime); font-size: 34px; line-height: 1; }
.hero-stats span { color: #bdd0cb; font-size: 13px; }
.focus-card { align-self: end; padding: 30px; color: var(--ink); background: var(--mint); border-radius: 22px 22px 22px 5px; }
.focus-card h2 { font-size: 30px; }
.focus-card .eyebrow { color: var(--teal-dark); }
.primary-button, .complete-button { display: inline-flex; justify-content: center; align-items: center; min-height: 48px; padding: 0 20px; border: 0; border-radius: 12px; color: white; background: var(--teal); font-weight: 750; text-decoration: none; cursor: pointer; }
.primary-button:hover, .complete-button:hover { background: var(--teal-dark); }
.primary-button:disabled, .complete-button:disabled { opacity: .6; cursor: default; }
.curriculum { padding: 80px 5vw; }
.section-intro { max-width: 720px; margin-bottom: 52px; }
.domain-section { margin: 0 auto 70px; max-width: 1280px; padding: 34px; background: rgba(255,255,255,.72); border: 1px solid var(--line); border-radius: 28px; }
.domain-heading { display: grid; grid-template-columns: 80px 1fr; gap: 22px; margin-bottom: 34px; }
.domain-index { width: 70px; height: 70px; display: grid; place-items: center; color: var(--teal-dark); background: var(--lime); border-radius: 20px 20px 20px 4px; font-weight: 850; }
.domain-heading h2 { margin-bottom: 10px; }
.domain-heading p { color: var(--muted); }
.module-block + .module-block { margin-top: 42px; padding-top: 42px; border-top: 1px solid var(--line); }
.module-heading { display: grid; grid-template-columns: 100px 1fr; gap: 20px; align-items: baseline; margin-bottom: 18px; }
.module-heading > span { color: var(--teal); font-size: 12px; font-weight: 800; text-transform: uppercase; }
.module-heading h3 { margin: 0; font-size: 20px; }
.lesson-grid { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 12px; }
.lesson-card { min-height: 150px; display: flex; flex-direction: column; justify-content: space-between; padding: 18px; border: 1px solid var(--line); border-radius: 16px; background: var(--card); text-decoration: none; transition: transform .18s, box-shadow .18s; }
.lesson-live:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.lesson-live { border-color: #89b9ae; }
.lesson-locked { color: #71817d; background: #f2f3ef; }
.lesson-card-copy { display: grid; gap: 9px; }
.lesson-number { color: var(--teal); font-size: 12px; font-weight: 850; letter-spacing: .08em; }
.lesson-title { font-size: 14px; font-weight: 700; line-height: 1.35; }
.lesson-card-meta { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin-top: 16px; }
.status-pill { padding: 4px 7px; border-radius: 99px; font-size: 10px; font-weight: 800; text-transform: uppercase; }
.status-planned { background: #e4e7e1; }
.status-available { color: #08534b; background: var(--mint); }
.progress-label { font-size: 11px; color: var(--teal); }
.lesson-hero { padding: 72px max(5vw, calc((100vw - 1180px)/2)); color: white; background: linear-gradient(120deg, #0b201e, #13433e 65%, #176d62); }
.lesson-hero h1 { font-size: clamp(42px, 6vw, 72px); }
.back-link { display: inline-block; margin-bottom: 48px; color: #cfe0dc; text-decoration: none; }
.lesson-meta { display: flex; gap: 10px; flex-wrap: wrap; }
.lesson-meta span { padding: 6px 10px; border: 1px solid #517c75; border-radius: 99px; color: #d7e6e2; font-size: 12px; }
.lesson-layout { max-width: 1180px; display: grid; grid-template-columns: 300px 1fr; gap: 50px; margin: 0 auto; padding: 60px 24px; }
.lesson-rail { align-self: start; position: sticky; top: 24px; max-height: calc(100vh - 48px); overflow-y: auto; padding-right: 8px; scrollbar-gutter: stable; }
.lesson-rail, .lesson-body { min-width: 0; }
.lesson-identity { margin-bottom: 14px; padding: 18px 20px; color: #fff; background: var(--ink); border-radius: 18px 18px 18px 5px; }
.lesson-identity h2 { margin: 5px 0 0; font-size: 18px; line-height: 1.25; }
.lesson-identity .eyebrow { color: var(--lime); }
.objectives-card { padding: 24px; background: var(--mint); border-radius: 20px 20px 20px 5px; }
.objectives-card ul { margin: 0; padding-left: 19px; }
.objectives-card li + li { margin-top: 12px; }
.lesson-jumps { display: grid; gap: 9px; margin-top: 18px; padding: 20px; border: 1px solid var(--line); border-radius: 16px; background: rgba(255,255,255,.6); }
.lesson-jumps .eyebrow { margin-bottom: 4px; }
.lesson-jumps a { color: var(--teal-dark); font-size: 13px; font-weight: 700; text-decoration: none; }
.lesson-jumps a:hover { text-decoration: underline; }
.lesson-jump-group { display: grid; gap: 6px; padding-bottom: 8px; border-bottom: 1px solid var(--line); }
.lesson-jump-group:last-child { padding-bottom: 0; border-bottom: 0; }
.lesson-jumps .cluster-jump { font-size: 13px; }
.concept-jumps { display: grid; gap: 4px; padding-left: 14px; border-left: 2px solid var(--teal); }
.lesson-jumps .concept-jumps a { font-size: 12px; font-weight: 500; line-height: 1.3; color: var(--ink-muted); }
.learning-block { margin-bottom: 56px; }
.collapsible-summary { display: flex; align-items: flex-start; justify-content: space-between; gap: 22px; list-style: none; cursor: pointer; }
.collapsible-summary::-webkit-details-marker { display: none; }
.collapsible-summary::marker { content: ""; }
.summary-copy { min-width: 0; display: grid; }
.summary-copy .activity-dek, .summary-copy .cluster-summary { margin: 10px 0 0; }
.collapse-hint { flex: 0 0 auto; margin-top: 5px; padding: 5px 9px; border: 1px solid currentColor; border-radius: 99px; font-size: 10px; font-weight: 850; letter-spacing: .06em; text-transform: uppercase; }
details:not([open]) > .collapsible-summary .collapse-hint { font-size: 0; }
details:not([open]) > .collapsible-summary .collapse-hint::after { content: "Expand"; font-size: 10px; }
.collapsible-content { margin-top: 24px; }
.lesson-introduction { padding: 30px; color: white; background: #102c29; border-radius: 22px; }
.lesson-introduction .eyebrow { color: var(--lime); }
.lesson-introduction .section-title { color: white; }
.lesson-introduction .collapse-hint { color: var(--lime); }
.lesson-introduction p { font-size: 18px; }
.lesson-introduction p:last-child { margin-bottom: 0; }
.cluster-section { display: grid; grid-template-columns: 62px 1fr; gap: 22px; padding: 10px 0 60px; }
.cluster-details { min-width: 0; }
.cluster-summary-control { padding: 4px 0 10px; }
.cluster-index { width: 52px; height: 52px; display: grid; place-items: center; color: white; background: var(--teal); border-radius: 14px 14px 14px 4px; font-weight: 800; }
.cluster-summary, .activity-dek { color: var(--muted); font-size: 18px; }
.concept-card { margin-top: 14px; padding: 22px 26px; background: var(--card); border: 1px solid var(--line); border-radius: 18px; }
.concept-card > summary { list-style: none; color: var(--teal-dark); font-size: 20px; font-weight: 800; cursor: pointer; }
.concept-card > summary::-webkit-details-marker { display: none; }
.concept-card > summary::after { content: "+"; float: right; color: var(--teal); }
.concept-card[open] > summary::after { content: "−"; }
.concept-card[open] > summary { margin-bottom: 14px; }
.concept-card p:last-child { margin-bottom: 0; }
.concept-example { padding-top: 14px; border-top: 1px solid var(--line); color: #314a45; }
.misconception { color: #764138; }
.callout { margin-top: 20px; padding: 16px 18px; border-left: 4px solid var(--lime); background: #f2f7dc; font-weight: 650; }
.critical-link { margin: 18px 0 0; padding: 18px; border: 1px solid #9bcfc2; border-radius: 14px; background: #edf8f4; }
.critical-link strong { display: block; margin-bottom: 5px; color: var(--teal-dark); font-size: 12px; letter-spacing: .08em; text-transform: uppercase; }
.critical-link p { margin: 0; }
.cluster-activity { margin: -28px 0 52px 84px; }
.cluster-activity .activity-panel { border-left: 5px solid var(--teal); border-radius: 0 22px 22px 0; }
.relationship-list { display: grid; gap: 12px; }
.relationship-card { padding: 20px; border: 1px solid var(--line); border-radius: 16px; background: var(--card); }
.relationship-card p { margin: 10px 0 0; color: var(--muted); }
.relationship-path { display: grid; grid-template-columns: minmax(0,1fr) auto minmax(0,1fr); gap: 12px; align-items: center; }
.relationship-path strong { padding: 10px; border-radius: 10px; background: var(--mint); text-align: center; }
.relationship-path span { color: var(--teal); font-size: 11px; font-weight: 850; letter-spacing: .08em; text-transform: uppercase; }
.distinction-grid { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 14px; }
.distinction-card { min-width: 0; padding: 22px; border: 1px solid var(--line); border-radius: 16px; background: var(--card); overflow-wrap: anywhere; }
.distinction-card p { margin-bottom: 0; color: var(--muted); }
.versus { display: grid; grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr); gap: 8px; align-items: center; margin-bottom: 12px; }
.versus span { color: var(--teal); font-size: 11px; font-weight: 900; text-transform: uppercase; }
.decision-rules { padding: 30px; border-radius: 22px; background: #e6efe5; }
.decision-rule { display: grid; grid-template-columns: 48px 1fr; gap: 16px; padding: 18px 0; border-top: 1px solid #c8d9cd; }
.decision-rule:first-of-type { border-top: 0; }
.decision-rule p { margin-bottom: 7px; }
.decision-rule small { display: block; color: var(--muted); }
.rule-number { width: 42px; height: 42px; display: grid; place-items: center; border-radius: 12px 12px 12px 3px; color: white; background: var(--teal); font-weight: 850; }
.flashcard-grid { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 12px; }
.flashcard { min-height: 96px; padding: 18px; border: 1px solid var(--line); border-radius: 14px; background: var(--card); }
.flashcard summary { color: var(--teal-dark); font-weight: 800; cursor: pointer; }
.flashcard p { margin: 13px 0 0; color: var(--muted); }
.reflection-block { padding: 30px; border-left: 5px solid var(--amber); background: #fff6df; border-radius: 0 20px 20px 0; }
.reflection-block li + li { margin-top: 10px; }
.activity-panel { margin: 0 0 32px; padding: 30px; background: var(--card); border: 1px solid var(--line); border-radius: 22px; box-shadow: 0 8px 30px rgba(17,33,31,.05); }
.activity-panel > form, .activity-panel > .game-start, .activity-panel > .game-stage, .activity-panel > .simulation-toolbar, .activity-panel > .simulation-frame-wrap { margin-top: 24px; }
.activity-actions { display:flex; flex-wrap:wrap; gap:10px; }
.secondary-button { padding:11px 16px; border:1px solid var(--teal); border-radius:10px; color:var(--teal-dark); background:white; font-weight:800; cursor:pointer; }
.activity-panel > .secondary-button { margin:18px 0 0; }
.question-card { margin: 24px 0; padding: 22px; border: 1px solid var(--line); border-radius: 16px; }
.question-card legend { max-width: 90%; padding: 0 10px; font-weight: 750; }
.question-count { display: block; margin-bottom: 4px; color: var(--teal); font-size: 11px; text-transform: uppercase; }
.option-row { display: flex; gap: 12px; margin-top: 10px; padding: 13px; background: #f7f8f4; border-radius: 10px; cursor: pointer; }
.option-row:has(input:checked) { outline: 2px solid var(--teal); background: var(--mint); }
.confidence-row { display: flex; align-items: center; gap: 8px; margin-top: 18px; }
.confidence-row > span { margin-right: auto; color: var(--muted); font-size: 13px; font-weight: 700; }
.confidence-choice input { position: absolute; opacity: 0; }
.confidence-choice span { display: block; padding: 6px 10px; border: 1px solid var(--line); border-radius: 99px; font-size: 12px; text-transform: capitalize; cursor: pointer; }
.confidence-choice:has(input:checked) span { color: white; background: var(--teal); border-color: var(--teal); }
.result-box { margin-top: 18px; padding: 18px; background: #f3f6f1; border-radius: 12px; }
.result-box p { margin: 10px 0 0; }
.correct { color: #16644d; }
.incorrect { color: var(--red); }
.game-start { display: flex; gap: 12px; }
.game-start select, .game-confidence { padding: 10px 12px; border: 1px solid var(--line); border-radius: 10px; background: white; }
.meters { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin: 24px 0; }
.meter { padding: 14px; background: #f6f7f3; border-radius: 12px; }
.meter > div:first-child { display: flex; justify-content: space-between; gap: 10px; font-size: 12px; }
.meter-track { width: 100%; height: 7px; display: block; margin-top: 9px; overflow: hidden; border: 0; border-radius: 9px; appearance: none; }
.meter-track::-webkit-progress-bar { background: #dfe4de; border-radius: 9px; }
.meter-track::-webkit-progress-value { background: var(--teal); border-radius: 9px; }
.meter-track::-moz-progress-bar { background: var(--teal); border-radius: 9px; }
.scenario-card, .ending-card { padding: 24px; color: white; background: #102c29; border-radius: 18px; }
.scenario-card .eyebrow, .ending-card .eyebrow { color: var(--lime); }
.scenario-card > p { font-size: 19px; }
.decision-toolbar { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin: 18px 0; }
.game-choices { display: grid; gap: 10px; }
.choice-button { padding: 16px; border: 1px solid #4b706b; border-radius: 12px; color: white; background: #173c38; text-align: left; cursor: pointer; }
.choice-button:hover { border-color: var(--lime); }
.game-feedback { margin-bottom: 12px; padding: 16px; background: #eef4e2; border-radius: 12px; }
.game-feedback p { margin-bottom: 0; }
.ending-card li + li { margin-top: 8px; }
.diagnostic-summary { margin: 24px 0; padding: 22px; color: var(--ink); background: white; border-radius: 14px; }
.diagnostic-summary .eyebrow { color: var(--teal); }
.game-total-score { display:flex; align-items:baseline; gap:12px; margin:12px 0; }
.game-total-score strong { color:var(--teal-dark); font-size:40px; line-height:1; }
.game-total-score span { color:var(--muted); font-weight:750; }
.game-scorecard { margin:20px 0; }
.scorecard-row { display:grid; grid-template-columns:160px 1fr 100px; gap:14px; align-items:center; padding:12px 0; border-top:1px solid var(--line); }
.scorecard-row > div:first-child { display:grid; gap:2px; }
.scorecard-row > div:first-child span { color:var(--muted); font-size:11px; text-transform:uppercase; }
.scorecard-row p { margin:0; font-size:13px; }
.scorecard-points { display:grid; justify-items:end; }
.scorecard-points strong { color:var(--teal-dark); font-size:18px; }
.scorecard-points span { color:var(--muted); font-size:11px; }
.competency-grid { display: grid; grid-template-columns: repeat(5, minmax(0,1fr)); gap: 8px; margin: 18px 0; }
.competency-score { display: grid; gap: 5px; padding: 12px; border-radius: 10px; background: #edf4ef; }
.competency-score span { color: var(--muted); font-size: 11px; line-height: 1.25; }
.competency-score strong { color: var(--teal-dark); font-size: 20px; }
.diagnostic-columns { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.diagnostic-columns > div { padding: 16px; border-radius: 12px; }
.strength-column { background: #e7f5ed; }
.weakness-column { background: #fff0e8; }
.diagnostic-columns article + article { margin-top: 12px; }
.diagnostic-columns p { margin: 4px 0 0; color: var(--muted); font-size: 13px; }
.simulation-toolbar { display: flex; align-items: center; gap: 18px; }
.simulation-status { margin: 0; color: var(--muted); font-size: 13px; font-weight: 700; }
.simulation-complete { color: #16644d; }
.simulation-frame-wrap { margin-top: 20px; overflow: hidden; border: 1px solid var(--line); border-radius: 16px; background: #eef2ec; }
.simulation-frame { width: 100%; max-width: 100%; display: block; border: 0; }
.lesson-dashboard { margin-bottom:30px; padding:26px; color:white; background:#102c29; border-radius:20px; }
.dashboard-heading .eyebrow { color:var(--lime); }
.dashboard-heading h2 { margin:4px 0; color:white; }
.dashboard-heading p { margin:0 0 18px; color:#cfe0dc; font-size:13px; }
.dashboard-metrics { display:grid; grid-template-columns:repeat(3,1fr); gap:12px; }
.dashboard-metrics article { display:grid; gap:7px; padding:16px; color:var(--ink); background:white; border-radius:12px; }
.dashboard-metrics span, .dashboard-metrics small { color:var(--muted); font-size:12px; }
.dashboard-metrics strong { color:var(--teal-dark); font-size:28px; }
.dashboard-metrics progress { width:100%; accent-color:var(--teal); }
.activity-status-grid { display:flex; flex-wrap:wrap; gap:7px; margin-top:14px; }
.activity-status-grid span { padding:5px 8px; border-radius:99px; font-size:10px; font-weight:800; text-transform:uppercase; }
.activity-done { color:#073d37; background:var(--lime); }
.activity-pending { color:#d8e5e2; border:1px solid #547b75; }
.video-section { margin:22px 0; padding:20px; border:1px solid var(--line); background:#f7f8f4; }
.video-section h3 { margin:0 0 14px; }
.video-grid { display:grid; grid-template-columns:repeat(auto-fit,minmax(260px,1fr)); gap:14px; }
.video-card { overflow:hidden; background:white; border:1px solid var(--line); border-radius:14px; }
.video-frame { width:100%; aspect-ratio:16/9; display:block; border:0; }
.video-frame-gate { min-height:150px; aspect-ratio:16/9; display:grid; place-content:center; justify-items:center; gap:10px; padding:20px; text-align:center; background:var(--mint); }
.video-frame-gate:has(.video-frame) { display:block; min-height:0; padding:0; }
.video-frame-gate p { margin:0; color:var(--muted); font-size:13px; }
.video-load-button { border:0; border-radius:10px; padding:11px 16px; color:white; background:var(--teal-dark); font-weight:800; cursor:pointer; }
.video-load-button:hover, .video-load-button:focus-visible { background:var(--teal); }
.video-link { min-height:150px; display:grid; place-items:center; padding:20px; color:var(--teal-dark); background:var(--mint); font-weight:800; text-decoration:none; }
.video-copy { display:grid; gap:7px; padding:14px; }
.video-copy p { margin:0; color:var(--muted); font-size:13px; }
.video-copy small { color:var(--muted); text-transform:uppercase; }
.media-error { min-height:150px; display:grid; place-items:center; margin:0; padding:20px; color:var(--red); background:#fff3f1; font-weight:750; }
.image-section { margin:22px 0; padding:20px; border:1px solid var(--line); background:#f7f8f4; }
.image-section h3 { margin:0 0 14px; }
.image-grid { display:grid; grid-template-columns:repeat(auto-fit,minmax(260px,1fr)); gap:14px; }
.lesson-image-card { margin:0; overflow:hidden; background:white; border:1px solid var(--line); border-radius:14px; }
.lesson-image { width:100%; height:auto; display:block; }
.lesson-image-card figcaption { display:grid; gap:5px; padding:14px; }
.lesson-image-card figcaption span { color:var(--muted); font-size:13px; }
.audio-section { margin:22px 0; padding:20px; border:1px solid var(--line); background:#f7f8f4; }
.audio-section h3 { margin:0 0 14px; }
.audio-list { display:grid; gap:14px; }
.audio-card { display:grid; gap:14px; padding:18px; background:white; border:1px solid var(--line); border-radius:14px; }
.audio-copy { display:grid; gap:5px; }
.audio-copy p { margin:0; color:var(--muted); font-size:13px; }
.audio-copy small { color:var(--teal-dark); font-weight:750; }
.audio-card audio { width:100%; }
.audio-transcript { padding-top:12px; border-top:1px solid var(--line); }
.audio-transcript summary { color:var(--teal-dark); font-weight:750; cursor:pointer; }
.audio-transcript p { margin:12px 0 0; color:var(--muted); font-size:14px; }
.lesson-navigation { display: grid; grid-template-columns: 1fr auto 1fr; gap: 16px; align-items: center; margin-top: 50px; padding-top: 30px; border-top: 1px solid var(--line); }
.nav-disabled { color: #88938f; font-size: 13px; }
.nav-disabled:last-child { text-align: right; }
.nav-link { color: var(--teal-dark); font-size: 13px; font-weight: 750; text-decoration: none; }
.nav-link:last-child { text-align: right; }

@media (max-width: 1000px) {
  .catalog-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .lesson-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .lesson-layout { grid-template-columns: minmax(0, 1fr); }
  .lesson-rail { position: static; max-height: none; overflow: visible; padding-right: 0; }
}
@media (max-width: 720px) {
  .catalog-grid { grid-template-columns: 1fr; padding-inline: 16px; }
  .header-note { display: none; }
  .course-hero { grid-template-columns: 1fr; padding-top: 60px; }
  .hero-stats { gap: 20px; }
  .curriculum { padding: 50px 16px; }
  .domain-section { padding: 22px; }
  .domain-heading, .module-heading { grid-template-columns: 1fr; }
  .lesson-grid { grid-template-columns: 1fr; }
  .cluster-section { grid-template-columns: 1fr; }
  .cluster-activity { margin-left: 0; }
  .game-start { flex-direction: column; align-items: stretch; }
  .game-start select, .game-start button { width: 100%; max-width: 100%; }
  .video-grid { grid-template-columns: minmax(0, 1fr); }
  .image-grid { grid-template-columns: minmax(0, 1fr); }
  .distinction-grid, .flashcard-grid { grid-template-columns: 1fr; }
  .relationship-path { grid-template-columns: 1fr; text-align: center; }
  .meters { grid-template-columns: 1fr; }
  .competency-grid { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .diagnostic-columns, .dashboard-metrics { grid-template-columns: 1fr; }
  .scorecard-row { grid-template-columns:1fr; }
  .scorecard-points { justify-items:start; }
  .lesson-navigation { grid-template-columns: 1fr; text-align: center; }
  .nav-disabled:last-child { text-align: center; }
}